For Patients & General Readers
Gout is a type of inflammatory arthritis caused by the buildup of uric acid crystals in the joints, often leading to sudden, severe pain, redness, and swelling. It commonly affects men and older adults, and if left untreated, can lead to chronic joint damage and kidney stones. Managing gout involves lifestyle changes and medications to lower uric acid levels and prevent future attacks.
Clinical Overview
Gout is a metabolic disorder characterized by inflammatory arthritis resulting from the deposition of monosodium urate (MSU) crystals in joints and tissues. It is associated with hyperuricemia, a condition of elevated serum uric acid levels, and can manifest as acute flares or chronic tophaceous gout.
Clinical Presentation
- Sudden onset of severe, intense joint pain, often at night.
- Erythema, warmth, and marked swelling of the affected joint.
- Peak intensity of pain typically within 12-24 hours.
- Most commonly affects the first metatarsophalangeal joint (podagra).
- Other commonly affected joints include ankles, knees, wrists, and elbows.
- Recurrent attacks if untreated, potentially leading to chronic gouty arthritis and tophi.
Signs & Symptoms
Symptoms (Patient-Reported)
- Excruciating joint pain, often described as throbbing or crushing.
- Joint tenderness, so severe that even the weight of a bedsheet is unbearable.
- Redness and warmth over the affected joint.
- Swelling of the affected joint.
- Limited range of motion in the affected joint.
- Fever and chills during acute flares (less common).
Signs (Clinician-Observed)
- Erythema and warmth of the skin over the affected joint.
- Edema and distension of the joint capsule.
- Tenderness to palpation.
- Possible presence of tophi (urate crystal deposits) in chronic cases, palpable as subcutaneous nodules.
Differential Diagnoses
| Condition | Distinguishing Feature |
|---|
| Septic Arthritis | Often presents with fever, chills, and a more systemic illness; synovial fluid analysis typically shows a high white blood cell count with a predominance of neutrophils and positive Gram stain/culture. |
| Pseudogout (Calcium Pyrophosphate Dihydrate Deposition Disease) | Joint fluid analysis reveals rhomboid-shaped CPPD crystals, often in older individuals, and commonly affects larger joints like the knee or wrist. |
| Cellulitis | Characterized by diffuse skin erythema and warmth, but typically lacks the intense, localized joint pain and swelling seen in gout. |
| Reactive Arthritis | Often follows an infection (gastrointestinal or genitourinary) and is typically associated with oligoarthritis, conjunctivitis, and urethritis (Reiter's syndrome). |
| Osteoarthritis flare | Pain is typically more chronic and insidious, with less acute inflammation, and often involves weight-bearing joints. |
| Traumatic joint injury | History of trauma, localized tenderness, and often ecchymosis; imaging may reveal fracture or ligamentous injury. |
Red Flags — Seek Immediate Care
- Signs of systemic infection (fever >38.5°C, chills, rigors) suggesting septic arthritis.
- Rapidly progressive joint destruction or deformity.
- Evidence of significant renal impairment or stones.
- Failure to respond to initial treatment, raising suspicion for alternative diagnoses or complicated gout.
Key Investigations
- Synovial fluid aspiration and analysis: demonstration of negatively birefringent, needle-shaped MSU crystals under polarized light microscopy is diagnostic.
- Serum uric acid level: typically elevated (>6.8 mg/dL or 400 µmol/L), but can be normal or low during acute flares.
- Imaging: X-rays may show characteristic erosions with overhanging edges in chronic gout; ultrasound can visualize MSU crystal deposition (double contour sign) and tophi.
- Complete blood count (CBC) and inflammatory markers (ESR, CRP): may show leukocytosis and elevated inflammatory markers during acute flares.
Management Overview
Management focuses on treating acute flares with NSAIDs, colchicine, or corticosteroids, and long-term urate-lowering therapy (ULT) with xanthine oxidase inhibitors (e.g., allopurinol, febuxostat) or uricosuric agents to prevent future attacks and complications. Lifestyle modifications, including dietary changes and weight management, are also crucial.
Disclaimer: This article is for educational purposes only and does not constitute medical advice.
Always consult a qualified healthcare professional for diagnosis and treatment.
TruelyserMD does not replace clinical judgement.